This chapter presents a study that aims at constraining the thickness of the slab in the mantle transition zone beneath northeast Asia through the method of caustic waveform modeling for both P and S waves. It discusses the author's finding of a thickened slab in the upper mantle transition zone beneath northeast Asia and the possible mechanism of its formation. The chapter first shows the sensitivity of the method to the structure around the 660-km discontinuity, and then briefly introduces the data sources and main features of the resolved P and S velocity models. It argues that the thickening of the slab due to buckling instability may partly explain the enigma of the missing Pacific slab. The chapter speculates that such a thickened stagnant slab might be close to an impending instability with a rapid flush of cold material possibly occurring in the next few million years.
|Original language||English (US)|
|Title of host publication||Subduction Dynamics|
|Subtitle of host publication||From Mantle Flow to Mega Disasters|
|Number of pages||14|
|State||Published - Sep 26 2015|
Bibliographical notePublisher Copyright:
© 2016 American Geophysical Union. All rights reserved.
- 660-km Discontinuity
- Buckling instability
- Caustic waveform modeling
- Northeast Asia
- P velocity models
- S velocity models
- Slab thickening
- Thickened stagnant slab